<template>
  <div class="list" ref="wrapper">
    <div>
      <div class="area">
        <div class="title border-topbottom">当前城市</div>
        <div class="button-list">
          <div class="button-wrapper">
            <div class="button">{{this.currentCity}}</div>
          </div>
        </div>
      </div>
      <div class="area">
        <div class="title border-topbottom">热门城市</div>
        <div class="button-list">
          <div
            class="button-wrapper"
            v-for="item of hot"
            :key="item.id"
            @click="handleCityClick(item.name)"
          >
            <div class="button">{{item.name }}</div>
          </div>
        </div>
      </div>
      <div class="area" v-for="(item,key) in cities" :key="key" :ref="key">
        <div class="title border-topbottom">{{key}}</div>
        <div class="item-list">
          <div
            class="item border-bottom"
            v-for="innerItem in item"
            :key="innerItem.id"
             @click="handleCityClick(innerItem.name)"
          >{{innerItem.name}}</div>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import Bscroll from "better-scroll";
import { mapState,mapMutations } from 'vuex';
export default {
  name: "CityList",
  props: {
    hot: Array,
    cities: Object,
    letter: String
  },
  computed:{
    ...mapState({
      currentCity :'city' //将vuex里面的city映射过来，名字为currentCity，
                          //用this.currentCity代替this.$store.state.city
    })
  },
  methods: {
    handleCityClick(city) {
      this.changeCity(city)
      this.$router.push({path:'/'})
    },
    ...mapMutations(['changeCity']) //将vuex里面的mutations方法映射过来，名字也叫changeCity
                                    //用this.changeCity(city)代替this.$store.commit('changeCity',city)
  },
  mounted() {
    this.scroll = new Bscroll(this.$refs.wrapper);
  },
  watch: {
    letter() {
      //一旦发现letter发生改变就会触发
      if (this.letter) {
        const element = this.$refs[this.letter][0];
        this.scroll.scrollToElement(element);
      }
    }
  }
};
</script>

<style lang='stylus' scoped>
@import '~styles/varibles.styl';

.list {
  overflow: hidden;
  position: absolute;
  top: 1.58rem;
  left: 0;
  right: 0;
  bottom: 0;

  .area {
    .title {
      line-height: 0.54rem;
      background: #eee;
      padding-left: 0.2rem;
      color: #666;
      font-size: 0.26rem;
    }

    .border-topbottom {
      &:before {
        border-color: #ccc;
      }

      &:after {
        border-color: #ccc;
      }
    }

    .button-list {
      padding: 0.1rem 0.6rem 0.1rem 0.1rem;
      overflow: hidden;

      .button-wrapper {
        float: left;
        width: 33.33%;

        .button {
          padding: 0.1rem 0;
          text-align: center;
          margin: 0.1rem;
          border: 0.02rem solid #ccc;
          border-radius: 0.3rem;
        }
      }
    }

    .item-list {
      .item {
        line-height: 0.76rem;
        padding-left: 0.2rem;
      }
    }

    .border-bottom {
      &:before {
        border-color: #ccc;
      }
    }
  }
}
</style>




